.450 Bushmaster, 18" Parkerized Heavy Barrel, 1:24 Twist, Mid-Length Gas System, 15" MLOK Rail|Upper|New MLOK
This BCA AR-15 complete .450 Bushmaster rifle length upper has a 18" heavy barrel with a parkerized finish, and features a 1:24 twist rate, with a mid length gas system. It includes a 15 1/4" MLOK rail, an M4 flat-top forged upper receiver, a BCA bolt carrier group, a flash hider, and a rear charging handle. This .450 Bushmaster upper is compatible with any mil-spec AR-15 lower. This has the new handguard. Lower receiver Rock River arms standaed lower.